Update dependencies (#35)

* update swift-crypto and remove swift-certificates

* add trailing comma

Update README.md

Prep for 1.0.0 Alpha

update docc documentation (#29)

Fix library biases (#28)

* change user id and challenge type to byte array

* rename a few properties

* update createRegistrationOptions documentation

* make PublicKeyCredentialUserEntity a struct

* make storedChallenge byte array instead of base64 encoded

* fix CollectedClientData challenge type

* fix CollectedClientData challenge type

* add getChallenge to RegistrationCredential

* remove Codable conformances

* wip

* wip

* wip

* conform PublicKeyCredentialRequestOptions to Encodable

* wip

* fix config documentation comment

* revert renaming beginRegistration

* update documentation comments

* fix tests

Convert PublicKeyCredentialRequestOptions.timeout to milliseconds (#26)

* Convert PublicKeyCredentialRequestOptions.timeout to milliseconds.

* Add reference to w3.org specification